It is way easier to fix a specific problem than to find one and sell solution for it.

For example, Hi I’m John and my accounting software can increase your profits by 10% by reducing time spent doing billing.

Vs

Hi I’m John, we do custom software and we can do an app for you in accounting for example, but also a crypto wallet or a booking website.

If you are in the second route, there is no mass outreach strategy because you are not offering anything specific your customer is anyone and your solution is anything. The outreach works for the first category, because spam or not, if someone is offering to fix a problem I have I’m ready to listen. Hence the relationship advice, if you provide services, people around you need to know that you “do apps and stuff”, and if you do products you can throw 1,000 emails fixing one thing with some level of certainty that someone within the ICP will give you a chance.